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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79c46bd1ecb206a66a925f7c8ca48b6895b32f5bc56d08fb5b875b07f1961b1a' 
  AND token = 'AxhTwGIrIHH5xzM1qZmrUrK53mibENoxm6GdptRMf+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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