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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f184e74c2596452e5fa5b74719f585ad9707d931373872e2b9fb875653d70c34' 
  AND token = 'UlbKMBI3dIztSsvFc3iABJK6lHtFqHssZ7FoexdizMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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