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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c32a78982312f95ab844969cef827ce4a54a18ff425e6c9cc66aeffac2a6b417' 
  AND token = '903R3riXzZKFJnyDEwjMhh5uBOqrs+eDSbeNfCns4OM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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