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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd28cbe1f09ce0a0173ea43658b33301fe81c04b7d12cb45edef5128efe763a0c' 
  AND token = 'eiZs7x2ZRO+gXWR6qwk3wrQqSqUZ3Iea4Ugdc7DRRks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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