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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a53507092793b51f1e4b3963870381050537e1b3a19c7d566004f75418cbc4ab' 
  AND token = 'p+Ek0qcN/3JkyzLs8h9kUj6NYYInXD/0JLHoztiwaXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00068

JSON explain

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