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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2dd23df7ce12dcbd51dde2b694b975446ea94cc84a4f933bc7905663aaf0f18f' 
  AND token = '6R467ixj+lLReO2RUtE9C/GtbgandERtxBssDsB92yo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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