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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74405a7a366a778c8d67997f82ff05d60fa46b96e79e3043b5311a0c5b1faa6c' 
  AND token = '5PxezJrLmo/fwDmaVm7nEywm4lMXNiP4G+Vhr6mldEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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