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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2666cc84d60a7cad77d963a1b381d68980f87f25a29c1d93cd3026a03ef15ad2' 
  AND token = 'r+MfgheY1Fa6G2ReXWS4iBbRVbX0ibbXBD8+7nunfLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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