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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62a9e44ea0ea88e7b4b92f72f40b8d9efc5896bdeca8612510d0cee4719e8aee' 
  AND token = 'TK748oStxrO4nT6jQan5ShD93drHX8sHk2vAMhzzpFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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