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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a836d4af8d0392e7b4c3b26ad6c5ad7cc6382bc7114ae2a5dea9ed6576eea65f' 
  AND token = 'C8jgyeDJ22ocBO889DpDlJSLOSBJA4FpEqu8Chz3Ngc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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