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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '473e99f63034985c7234125f89735ec7702e90a6f200311730dbabd0ee9d4fbd' 
  AND token = '5PL/Z3Q9keQ1qnZE4wC7ypeg/As3o/30XhY5FZ1bYCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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