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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07b03b04b6bf920ddc29bf9b6f76ceb95f433066b132194993251bd539b733bf' 
  AND token = 'arxyjjg7F6hR0UY6cvPHCATPzNQfqmUclDPICo+XewE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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