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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1413bce65ec1c76036510532a93749472d273f204a675e117984b029ed7c12c' 
  AND token = 'ifhb4yDQ+jD2pi2uY86luD1xSpP46aayeSDHsSejq1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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