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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79f056d4ea45dc728f9baa7355010aaaa040e84cbd1a00f72446e6e0d3cb4e2e' 
  AND token = 'IRAY+Ip7GgU6p2MpfJHQAcQTvtHTNWhHbCCIP5pSDe4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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