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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a2df88f50d509af7bbfa9d158a5aae6073c4598f58185c49b37238123a55c72' 
  AND token = 'iq7psnUngLYN1rWPHUkMF7hMgWboz0l8cn3mIoFdNf8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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