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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e9eba2b5d896b1a5b113331d0b05f5c0110d72180d567ca1b64ebe1311c2f89' 
  AND token = 'Ddz4gzpSmBzecXkpszdTYJ2/0bA/vQ6/mxELMdphK0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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