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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc1eaba9455d24f47c70bdc381c3c25a6bd023c55ed667ce766029bd71e2e25e' 
  AND token = 'Gi6uYGQYV0FaLWYzFpQ0oZpRxCnWc96NUSHGKvXHklo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00073

JSON explain

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