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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5ba6eac95ed4eab98cae71787ca9564682ec3ae5ab1ab918d99f6d2daeda063' 
  AND token = 'SGbU4NWNdQhLSvWtCpK4/hnFW1wVucgg/8drnS4QHxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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