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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e01a1b1205dc0d773b6bc21989ff6652a36134db2f61f67fc5b53edfdc8f7665' 
  AND token = 'N4DWylaX4oJPbcFVs3SwwKhoaOECC8clJHb/Y8ycSsw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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