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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '212c4a8e0be43d6cf69c2e73e46972e7f1160843ef631dbe459b8bc92ee0adb7' 
  AND token = 'aGEXoLDoidgBSVE5ICHywKewsCKvywT8R1v3owe+Pvc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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