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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bea95af2764d24e6a27b895b55da87e7c757886617cf4bb7f9061b3388e8ca7' 
  AND token = '1nPhkz5p7KDbdOJk4L3OCwVdFLCMAGtgPa6LkfYojZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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