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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebd5a40c7ff64047cb459e9956bd906353e4874279620394e81f972548fbd0d0' 
  AND token = 'cmHrju/lUyAzdHk8G2XV4z10BdnpxcUbq73bbmfMvu0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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