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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a26a00b08c573ef42369009d29a20ae9815dac0789f86bff73f8eb1b33ee31f7' 
  AND token = 'FqN5Jsoer+ronfp1pBBVriVBdxIynyY2BRlw2M3W8Ro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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