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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1190757ab074790bb7c22efeb4a3edc87f6edd2b508ea397d138c1a438e0718d' 
  AND token = '3CbWkK8T0Vm9ZxImL/6ft5tfmHjsYxvutzzTZtt8eOo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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