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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12a93b18ea732a94f21dea8ca1785034f606cc8aa263fdb9caecb1c35904346d' 
  AND token = 'ZAbTdZ9Zh02uKh5SocoLCe+h7oi1cRhOHwMAwQkzBYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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