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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84a05f0ee2b3d143eb40661d6d67c59afcf626b05585e155a4aaf44c2be2b877' 
  AND token = '7egq5z51WEyg7dcqZPyS13/aQqd8vcF9PYjITnoOtQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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