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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf85776ff2dd5d0ebf692edb48dc4fd1032701b00cc667d6d35d798ae6639690' 
  AND token = 'zPNWUYTfq1UV7cEFx9DiKcfKz9mt/mJZHipr1ZZgF2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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