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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e266c047f26e04663a735d2e055f5624b43d5ff39332abf60683f87c2e428bb1' 
  AND token = 'wIFfB27fYvIQSFmEQAaigBCS1KbvefP79ubVugcd9lQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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