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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1f5d38643ad6f1a5bed40c097cf97e57f6ec0ab3172576522b2c314c7c4503b' 
  AND token = 'B1JYH8omLw84tSZCkA9kqSbM4wNSovW1BpV4JecQyno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00080

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}