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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3192fb55ce315e0d4c6b282b77b0883796c38fdc4db521a126339857d39e3a2' 
  AND token = 'V9oTbSFQ4lqxu6sisSqcpS6LXIRkuD56wd9f3j46roc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00093

JSON explain

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