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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bb7a44d7cb2792ae1cf64993db0db789abb9124dbe374a790148a30a48c1f39' 
  AND token = '4k/Q6F/uhaHQ+tNv6v5SRFxHzQdo/ofdiKcASX3FqCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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