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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76ae5a36a01d1042379a41582ad6df7e6a4ecd1e656b2b9d0bcdf55f1cca1f29' 
  AND token = 'LEmDfR6HT5v7xWdny226C4wC5G8aocHPr8QMOJzQnyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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