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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f7c7f1167baaa87d00ccf64b83a4cc0c51b8dacd3a5dea98688f131b7f78682' 
  AND token = 'f3LxIDnzhMlIdfNElQYuzVLKaHamrqUArtXrkLUm2BU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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