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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d9865cedde30ee2fde83f18c63b0e679c6dadedceed7a9693aa2fbc7fab65ec' 
  AND token = 'CjKlUXgJvXg3rm/lo0RrUcsC/mO04n8iVlkSDp/i7ZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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