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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edccf9a7528824080d6f550ab3687a2f31db12171e1623f0f91a3b776798e5b7' 
  AND token = '3oKp2j0sedQvd/kU5x036g1e/iOFGk8iq1/Uj6+vq0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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