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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2b687e450c1ad547cab2f16e79b6edeae376f6a9c493c54f98af1bc87561f47' 
  AND token = 'wTjd3i/9NxkGI/7N02D5FTDNN3RbQNCLOYrBsrwP3r4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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