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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '833a72f2a29ddfc7871840d7242bd90dac0564fc4822fcb9f95c206c6a07f15a' 
  AND token = 'k7XL99Nx3f01ZBGG1OKh/my5puWuf6SJuoVjS/uj0YA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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