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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '595eb40927ed199506b0c53a6b71aaa2fa76a01afcd55249632f606272d8d47c' 
  AND token = 'kIk1n0ZH3XDSY7nXybHxjI0nTrTppGTD7HCA4xf+IMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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