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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5bf25b6c4c898109c5acf2edb94b2c538449c3491de07cb88106e9ab679ca52' 
  AND token = 'AhZEQ+zJyoglNWAUythvMUr4eLBncNQMiz86T/HygT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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