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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c4e410d803aede21d0ba6531a6b88ccf6ad4ca9fe643359232e8d3d4a97ba84' 
  AND token = '4o0dn5jTjtUnE/urS91kbI/wSo68Tib6yCjoSMYAres=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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