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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02eb6640bdf204bccbec59cf3e8900156ab254d7a7337d96ecf84d5e3736fdcf' 
  AND token = '1sS6Oa/YydmxH0WLALnS0npzPB6gAd1sgujDxuNTVWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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