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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3c04be3d314b028ff1573a9e47c751c4821ffe5b6463564334691f1e7f92bfa' 
  AND token = 'pax8In8z5arXAeP0hDUg5W1Cadz91Q+jEJY97U4Fz8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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