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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7802992e9f59d8baed7ea995b576533ddc20f6d030bfb96b8621697150a6e28b' 
  AND token = 'Q0FzahItzW8/1yQSeTMtmiQt5tx7SJzm0PiegmRnZPo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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