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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '202c952ea2b56e5d18f9d9006e25261f5cea09fd7bde6ca517b8cb5761404d94' 
  AND token = '5XeIfnv/RAw1ndHM2+NtuKZPdG7gTRSllE0+u3Oou20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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