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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a09197798f42fdec6b521a2377183622ba98784fe1f55a80da5b6082f7504693' 
  AND token = 'multfr16FelWIQWabgVvCbQ2TRaNXrQQoAfU3MOj4W8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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