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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5e5e7e500c501e0d46a2d8052089a4c1646c386573176dd9fa230e41b127a8b' 
  AND token = 'AUeXgK4nsNGa862FdtO1UhO3dKEkW6Ya95tZsk45fLU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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