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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '282702bc9e03d68f0bcf7ece8e9f12bac80e7c1a80ddb61168798896f27790a4' 
  AND token = 'LuG3NEfMc20yhhR21uB5jMPgpgaiaWYuS/sRFRuW4Uo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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