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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84db036bfb71a3fca26b62c214354daa232fb106f161619cecd23bfc8e16fcdb' 
  AND token = '7IzqBUtUAkiOD9evTydNTNPQCVTWXHwnCxKso+5mjBo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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