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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd530910901024a8dca6c31d7f483958cd0dbc15c7a2528294db970ae415ab5b8' 
  AND token = '/AxnRGhaEWCiqUa/97FbFRGkduDTf7/CUZfR6z76f+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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