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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '798d020d6bab58511121a53637b1640ac6ae39b830c21cfccd839d95e404b35d' 
  AND token = 'WV4F/K4JCGea6DQ/uFWi23emqbOyX2Kqcpybr0wyE6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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