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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80f28ba63fba23d5c4d0543e0176b76a087030fadae766e7952fb28e9105d3f2' 
  AND token = 'lOjXYASWhi5kgzJMo3RaID5txnWS7IFWmhb5eKcHptU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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