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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd097a6adde91d0baf1fa4189803f267e2ab6b262b8cb737ad32758a2a05a3055' 
  AND token = 'u8/ugDqxNJ4F40f1fkSHEoV50JGZWk7+PY0pKUan4AM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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