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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94b18f45963d10df8fc35ddf1dcbbe4da1e064d0a049f79d499f2284def8de49' 
  AND token = '9VvU916xz7Pm2oRy9rLAtPdTiLmsFIkqNYegssO2akw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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