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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b96bb74586afa9954df1a13100334d11d6651f29769b7bc154e20bc2941c682' 
  AND token = 'Y/cHqmY/D49gX3qAIRS6IVOIJeUVuJ68RD8o+I6cC60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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