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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5790617c9331c2f5e4501b3cb62cbfd8c59ff704f3496def38c89663d1dd431' 
  AND token = 'pAhZ8qdN5BoFdla/3TOD/ehkIXSYbYcTnzqpgopwkh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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