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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf8cc3d6c00c1d4770ca8219c1fdb8b034ff0c4984e0dd8bd85329eab54a586f' 
  AND token = '7faxA9AiGJp7Y6uxKArShHcX0xPATe/q+6QfRkaLFcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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