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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51eaf0235d9ab1401ce0db2e6ae86fc3d6a5561ccb50a348d9480052a2a406d9' 
  AND token = '94uJ7gvcFADiFSyGQvrZYadehHIiygnqwZOwIqpFIaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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