SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb89c6d2be0620a5a39018d97549c0e1b21475f83a1d97c6b7db41c59cf0724b' 
  AND token = '7dprhX4i1cmk1wV+bcqLLZxFvagKcXRtwcLZNCAojBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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