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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52c2c7a422006680bfe0739a3c36ed97146aa886b26be05696344c9a3490f1b8' 
  AND token = 'uRl942EHGmZ5tR6zqkoZV9dgoRHrZVjTM39sDrhRGYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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