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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e80417bf99752f7f29713197328ebb87c0a44689adeb52ad66f8d27f4fffe2ee' 
  AND token = 'f32T4PIylzt31dm7yDQcY5KGhgvLPLoRwMaDBUlP9JE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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