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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c7f788a59690d76d55ddd1b9a1bd6030ef236f47c439f3f148fd6dfb54051a2' 
  AND token = 'cRRlcVUqFa8avbq0rWMq6ei7QsdOo7CHWTMl60ki6T4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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