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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd311e10f96732ab2c63956f047a2d09110ae1bbdc95791efba569ecb2ace7b3' 
  AND token = 'GbR2+ndzDoYxYeAwsC6qFzHkHca0ZK6bKyGuqquWDHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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