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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c910b31aca233cdf78fcb6e0de2377160fbeee85271875f61360b4420c4b732' 
  AND token = 'kY3Rxvrqflby5An7eUrrKrY2253y8DyA2sLKUF0AiVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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