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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58f657945dc6f9821e1e964b14d4e08796a69c6542a15ebbc88c264f714f5c5e' 
  AND token = 'HzuV5dboX/WZS90/WcDveTyj8LxZybA2hH3HF/QI3OM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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