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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abdd40a5ed91832716373080fd853ec7d8b6201fbfb6c777dc579f12cda753b2' 
  AND token = 'Glqfu8Tox5/y9n40p4VwvL7pWgMrKvtbl5EqY/6mg6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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