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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2a3e52e85fc6d961beb65ad318415cecc225dd36ed0382444ed7192fea10cf3' 
  AND token = 'SvMSE5nrPwtynH0Fj+aF2iQCXYZ94hprA7ycHKdWLrA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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