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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97703ed13c931b65d4b4f8a1a59eb960366c76ca78ddf84b968b8ea24766a1ae' 
  AND token = 'w2p5wfM1HsBIdWSNwTXEJzYQgcFO89kih395OZ3K3N4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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